Abstract
In this paper, a novel micro-displacement sensor with double optical fiber probes is proposed and designed, which can realize the highly sensitive sensing of longitudinal or lateral micro-displacements. The optical fiber probes are made through photopolymer formulation, and the effects of reaction time and optical power on the growth length of the probe are illustrated. The relationship between light intensity and longitudinal micro-displacement is a power function in the range of 0–100 μm at room temperature with a correlation coefficient of 98.92%. For lateral micro-displacement, the sensitivity is −2.9697 dBm/μm in the range of 0–6 μm with a linear fit of 99.61%. In addition, the linear correlation coefficient decreases as the initial longitudinal distance increases, and the function of these correlation coefficients is also linear with a linearity of 96.14%. This sensor has a simple manufacturing process, low cost, high sensitivity, and fast response speed. It is suitable for harsh environments such as strong electromagnetic interference and corrosivity, and has a broad application prospect in the field of micro-displacement sensing.
Highlights
Displacement is an important characteristic parameter in industrial products
Π are fixed in the optical fiber fusion splicer, and the tips of two probes are on the same longitudinal
The test principle of micro-displacement sensor is shown in Figure 6; both optical fiber probes about 18.6 μm, and the diameter was about 9 μm
Summary
Displacement is an important characteristic parameter in industrial products. At present, with the continuous development of manufacturing technology, the requirements for processing accuracy and technical indicators are getting increasingly higher [1], so a faster and more flexible measurement method that can directly achieve the nondestructive product quality inspection during the production process is needed. For the application of optical fiber in the field of micro-displacement sensing, Fan et al [4] proposed a method for detecting micro-displacement by using fiber end-face microsphere coupling; this sensor can only measure the longitudinal micro-displacement, and the sensitivity is low—only 0.00401 dBm/μm. Zhu et al [7] proposed and demonstrated a novel optical-fiber micro-displacement sensor based on surface plasmon resonance (SPR) by fabricating a Kretschmann configuration on graded-index multimode fiber (GIMMF). This micro-displacement fiber sensor has a high sensitivity with a maximum of up to 10.32 nm/μm, but its detection range is only from 0 to 25 μm, and it can only realize longitudinal micro-displacement detection. Almost all research only focuses on single-direction micro-displacement sensing and rarely involves multidirection sensing, which severely limits the application range of optical fiber displacement sensors
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